zotero works good on other database such as JSTOR, it could recognize pdf and download it. but it couldn't grab PDF on CNKI. sometimes the icon apears as an folder instead of a journal, and "save to zotero(DOI)" instead of "save to zotero(CNKI)". most of the time there is only a gray webpage icon.

I have tried two days and nothing improved. it works alright until couple days ago.

I am using windows 11 and the database is as follows:
https://www.cnki.net/

and detailed example areas below:
https://kns.cnki.net/kcms2/article/abstract?v=3uoqIhG8C44YLTlOAiTRKibYlV5Vjs7iJTKGjg9uTdeTsOI_ra5_XZb5-oGYeLsad_kEYSvrjm3CMFSRSAwJstUdSm87oyPw&uniplatform=NZKPT

https://kns.cnki.net/kcms2/article/abstract?v=3uoqIhG8C44YLTlOAiTRKibYlV5Vjs7i8oRR1PAr7RxjuAJk4dHXoiUqx63VFB1mBYVAJeQGw44iVpBB8FxKQSoU6T0o_2kY&uniplatform=NZKPT